<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>下拉选</title>
    <link rel="stylesheet" href="../../css/bootstrap.min.css">
    <link rel="stylesheet" href="../../bootstrap-icons-1.13.1/bootstrap-icons.min.css">
    <script src="https://code.jquery.com/jquery-3.5.1.slim.min.js"></script>
    <script src="https://cdn.jsdelivr.net/npm/popper.js@1.16.1/dist/umd/popper.min.js"></script>
    <script src="../../js/bootstrap.bundle.min.js"></script>
</head>
<body>
<div class="container">
    <div class="dropdown">
        <button class="btn btn-primary dropdown-toggle" data-toggle="dropdown">
            下拉按钮
        </button>
        <ul class="dropdown-menu">
            <li>
                <a href="#" class="dropdown-item">选项一</a>
            </li>
            <li>
                <a href="#" class="dropdown-item">选项二</a>
            </li>
            <li>
                <a href="#" class="dropdown-item">选项三</a>
            </li>
        </ul>
    </div>

</div>
</body>
</html>